There have been some questions about the new CA 2.0 wheel, tire clearance and brake reach. I’ll try and clear those up here.
The 650c (that is 571 mm ) rear end CA 2.0 has 11mm clearance between a 23 mm x 571mm tire and the frame,
Short reach brakes like the Zero-G will reach the 650c (571mm) rim with no problems.
You can put a 559 (26” mt.bike rim) in the frame and with the Bacchetta rear brake it reaches the rim no problem, room to spare. Put a 26 x 1.25” (32mm) like a Kenda Qwest you have 6mm clearance between frame and tire.
The 700c (620mm) CA 2.0) current proto-type rear end with a 700c x 23mm tire gives you 6mm clearance between the tire and the frame. The Zero-G short reach brakes fits with no problems and it looks like we could add 3mm more of length to the chain stay to gives us some possible options of getting a 28mm tire into the 700c rear end.
Looks like the CA 2.0 is going to be a great all around bike, I can envision many uses of this bike from hard core racing to light touring and of course doing the full brevet series.